In a never-before-seen feat, SpaceX also managed to guide at least two of the Falcon Heavy’s first-stage rocket boosters to land upright back on Earth. They cut back through the Earth’s atmosphere and landed in unison at a Kennedy Space Center landing pad. The third booster was supposed to land on a sea-faring platform called a droneship, but it wasn’t immediately clear if that landing was successful.

On board the rocket that’s now headed deeper into space is Musk’s personal Tesla roadster. At the wheel is a dummy dressed in a spacesuit, and the car is blaring David Bowie’s “Space Oddity” on an endless loop. Cameras on board the car showed it headed deeper into space. Musk plans to put the car into orbit around the sun.

Musk announced last year he planned to put his car on the inaugural Falcon Heavy flight. When asked on Twitter why he wanted to throw away a $100,000 vehicle, he replied, “I love the thought of a car drifting apparently endlessly through space and perhaps being discovered by an alien race millions of years in the future.”

Tuesday’s success marked a huge step forward for a company that’s already managed to shake up the rocket industry with its groundbreaking technology.

The company made the world take notice when it proved it can safely return first-stage rocket boosters to Earth with its Falcon 9 rocket, which the company has used for more than 40 missions dating back to 2012.

Those rockets have a single first-stage booster, and SpaceX has safely recaptured them after 21 Falcon 9 launches.

Now, SpaceX routinely puts used boosters back to work. In fact, the inaugural Falcon Heavy flight actually used two pre-flown Falcon 9 boosters (the center booster was new.)

Reusing hardware is part of SpaceX’s plan to drive down the cost of launches.

Before SpaceX came along, companies just discarded rockets after each mission.

It’s not, however, the most powerful rocket in history. That honor belongs to NASA’s Saturn V rocket, which was used for the Apollo moon landings and was retired in the 1970s.